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* macOS: enable CH341 LoRa-hardware path — fix serial truncation, document setup
Verified on Apple Silicon with a CH341A USB-SPI bridge (VID 0x1A86,
PID 0x5512) wired to an SX1262 (Meshstick variant) that the existing
`pine64/libch341-spi-userspace` lib_dep works on macOS as-is — Apple's
bundled CH34x driver only matches the CH340 *UART* variant
(PID 0x7523), so the CH341A's interface 0 is left unclaimed and
libusb opens / configures / claims it directly via IOUSBHostInterface.
End-to-end test: meshtasticd boots, libusb claim succeeds, SX1262 init
returns 0, TCP API serves the meshtastic CLI's --info / --sendtext flow.
Two changes:
1. **`PortduinoGlue.cpp:497`**: pass `sizeof(serial)` (= 9) instead of
the literal `8` to `Ch341Hal::getSerialString()`. The function in
`USBHal.h:61-68` treats `len` as buffer size and reserves one slot
for the null terminator (`bytesCopied = (len - 1) < 8 ? (len - 1) : 8`),
so passing 8 produced a 7-char serial — which then broke the
`strlen(serial) == 8` check at line 502, skipping the auto-MAC
derivation from serial + product string. On Linux this was masked
by the BlueZ HCI MAC fallback in `getMacAddr()` at lines 139-157,
but on macOS that fallback is `__linux__`-guarded so the serial path
is mandatory and the truncation left `mac_address` empty, causing
the daemon to exit with `*** Blank MAC Address not allowed!`.
2. **`variants/native/portduino/platformio.ini`**: expand the
`[env:native-macos]` comment block with a "Real LoRa hardware on
macOS" section. Documents:
- Why no upstream library change is needed (Apple kext targets
CH340/UART, not CH341A/SPI; libusb's `#ifdef __linux__` skip is
correct for macOS in this case).
- How to point `meshtasticd` at an existing platform-agnostic
`bin/config.d/lora-*.yaml` for CH341 hardware.
- The auto-MAC-derivation contract (now working with this fix).
- `ioreg` and `LIBUSB_DEBUG=4` diagnostic recipes for the failure
mode where a third-party WCH `CH34xVCPDriver` *would* claim
interface 0 (`kmutil unload -b <bundleID>` workaround).
No upstream library forks, no PR chain, no additional lib_deps —
the existing `pine64/libch341-spi-userspace` + libusb-1.0 stack does
the right thing on macOS already.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
* Apply suggestion from @Copilot
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
---------
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>